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                Freda的传呼机                </h1>
                <p>时间限制：2s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：128MB</p>			</div>
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                                <h3>题目描述</h3><p><p><span style="font-size: medium">为了随时与rainbow快速交流，Freda制造了两部传呼机。Freda和rainbow所在的地方有N座房屋、M条双向光缆。每条光缆连接两座房屋，传呼机发出的信号只能沿着光缆传递，并且传呼机的信号从光缆的其中一端传递到另一端需要花费t单位时间。现在Freda要进行Q次试验，每次选取两座房屋，并想知道传呼机的信号在这两座房屋之间传递至少需要多长时间。Freda和rainbow简直弱爆了有木有T_T，请你帮帮他们吧&hellip;&hellip;<br />
N座房屋通过光缆一定是连通的，并且这M条光缆有以下三类连接情况：<br />
A：光缆不形成环，也就是光缆仅有N-1条。<br />
B：光缆只形成一个环，也就是光缆仅有N条。<br />
C：每条光缆仅在一个环中。</span><span style="font-size: medium">。</span></p></p><hr/><h3>输入格式</h3><p><p>&nbsp;</p>
<p><span style="font-size: medium">第一行包含三个用空格隔开的整数，N、M和Q。<br />
接下来M行每行三个整数x、y、t，表示房屋x和y之间有一条传递时间为t的光缆。<br />
最后Q行每行两个整数x、y，表示Freda想知道在x和y之间传呼最少需要多长时间。</span></p></p><hr/><h3>输出格式</h3><p><p><span style="font-size: medium">输出Q行，每行一个整数，表示Freda每次试验的结果。</span></p></p><hr/><h3>样例输入</h3><pre>样例输入1
5 4 2
1 2 1
1 3 1
2 4 1
2 5 1
3 5
2 1

样例输入2
5 5 2
1 2 1
2 1 1
1 3 1
2 4 1
2 5 1
3 5
2 1

样例输入3
9 10 2
1 2 1
1 4 1
3 4 1
2 3 1
3 7 1
7 8 2
7 9 2
1 5 3
1 6 4
5 6 1
1 9
5 7</pre><hr/><h3>样例输出</h3><pre>

样例输出1
3
1

样例输出2
3
1

样例输出3
5
6</pre><hr/><h3>提示</h3><p><p></p>
<p>对于100%的数据，2&lt;=N&lt;=10000，N-1&lt;=M&lt;=12000，Q=10000，1&lt;=x,y&lt;=N，1&lt;=t&lt;32768<br />
</p></p><hr/><h3>题目来源</h3><p>Poetize9</p>
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